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Old May 12th 2016, 02:58 PM   #1
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Homework problem

hello all
i have a problem to my homework ,

in the balloon with 4 liter volume , is 1 gram of hydrogen. how molecules of this gas as found in 1cm3, if the molar mass of hydrogen is 2g/mol ?

please help me i need a solution
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Old May 13th 2016, 05:49 AM   #2
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I'll step you through this:

1. The molecular density of H2 is 2 g/mole, so one gram of H2 is equivalent to how many moles?

2. Multiply the result of part (1) by the number of molecules in a mole. This tells you how many H2 molecules are in the balloon.

3. The balloon is 4 liters in volume - convert this to cm^3 (there are 1000 cm^3 per liter).

4. Divide the answer from (2) by the answer from (3), to get molecules per cm^3.

Post back with your answer and we'll check to make sure it's correct.
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